AA 12 then AA 4444 at Boston
Los Angeles → Boston → New York JFK
Timetable, Boston time
16:37AA 12 from Los Angeles at the gate
17:30AA 4444 to New York JFK leaves the gate
53 min apart on the timetable
Boston’s board gives an arrival time for only about 59% of its flights, so many days show no gate time.
The last days
AA 12 and AA 4444 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.